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Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites

DRS at CSIR-National Institute of Oceanography

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Title Evidence of Himalayan erosional event at approx. 0.5 Ma from a sediment core from the equatorial Indian Ocean in the vicinityof ODP Leg 116 sites
 
Creator Nath, B.N.
Gupta, S.M.
Mislankar, P.G.
Rao, B.R.
Parthiban, G.
Roelandts, I.
Patil, S.K.
 
Subject erosion
sediments
mineralogy
geochemistry
magnetic susceptibility
rare earths
grain size
organic carbon
terrigenous sediments
detritus
 
Description A sediment core collected from an area _100 miles south of the ODP Leg 116 (distal Bengal Fan) in the equatorial Indian Ocean was investigated for microfossils, mineralogy, mineral chemistry, magnetic susceptibility, grain size, major, minor and rare-earth element geochemistry, organic carbon and total nitrogen contents in the bulk sediments. Distinct changes in depositional characteristics (including presence of abundant sand-sized micas and other detrital minerals) occur at two sub-surface depths corresponding to approx. 0.5 and probably 0.8 Ma time periods. The detrital mineral suite of this core resembles that of turbidite unit 1 sediments of ODP cores in the distal Bengal Fan. The core site has received an increased supply of terrigenous sediments at these two time periods, the older pulse (0.8 Ma) stronger than the younger pulse. Several lines of evidence such as the nature of the mineral suite, lower magnetic susceptibility values, Si/Al in mica mineral separates; major element composition; discrimination plots of Ca/Ti versus K/Ti and K sub(2)O/Al sub(2) O sub(3) and La/Yb ratios suggest a highly metamorphosed source such as higher Himalayan crystalline (HHC) series indicating two events of increased physical weathering and erosion in the Himalayan region. While the erosional event of 0.8 Ma is well known, the episode of 0.5 Ma was not reported earlier.
 
Date 2008-02-22T05:30:13Z
2008-02-22T05:30:13Z
2005
 
Type Journal Article
 
Identifier Deep-sea research. Part II. Topical studies in oceanography, Vol.52; 2061-2077p.
http://drs.nio.org/drs/handle/2264/946
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Elsevier